Breadcrumb Home > Thesaurus > E Cite Synonyms of erst Find synonyms for: Adverb1. once, formerly, at one time, erstwhile, erstusage: at a previous time; "at one time he loved her"; "her erstwhile writing"; "she was a dancer once";WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.Definition and meaning of erst (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. February 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress The Women's March on Versailles Keeping Your Brain Active in a COVID-19 World The Manchu Related Content Daily Word Quiz: oleaginous Analogy of the Day: Today?s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language